4NR52.

An extremely difficult battery to find! There are some available if you look hard enough but you can make a good bet that yours will go flat when you can't find any.
It is possible to use the A544 6V Alkaline battery or equivalent, though I'd stay away from the Silver Oxide 6.2 volt type if replacing a Mercruy original, with a small spring inserted to take up slack. Wrap the A544 in some cardboard to make it roughly the same diameter as the original, then use the spring, as shown right, to take up the difference in length.

Equivalents:

1404M, 164, 4NR52, A32PX, E164, HM-4N, PC164A, PX32, PX32A, PX32B, TR164, V164PX,

Image
not to scale. Common
Name. Dimensions.
Length × Diameter. Chemical Composition. Nominal Voltage.

PX32. 44.9 mm × 17.1 mm
Contacts:
Raised area Positive
Raised area opposite end Negitive.
Lithium replacement for original Mercury. 6 volts.
(5.6 volts
for the discontinued Mercury types)

Image not to scale.	Common Name.	Dimensions. Length × Diameter.	Chemical Composition.	Nominal Voltage.
	PX32.	44.9 mm × 17.1 mm Contacts: Raised area Positive Raised area opposite end Negitive.	Lithium replacement for original Mercury.	6 volts. (5.6 volts for the discontinued Mercury types)

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